Emily from SWISCO responded:
June 11, 2021
Hi there! It looks like you have our 15-180 coil balance shoe which uses our Series 190 coil spring. Look over our dimensions and compare them to your current hardware to see how they match up. |
Emily from SWISCO responded:
June 16, 2021
We do sell our 15-181 double coil support and our 15-180 uses the Series 190 coil spring. Each of these items are sold separately. To confirm you get the correct spring tensions, you can weigh your window sash and divide the precise weight by the number of coils in the window. |